Health: Air convection is good for your health, allowing you and your family to enjoy a non-toxic and harmless driving environment. Energy saving: Using Polycrystalline solar panels, no power supply is required to charge the battery. Solar power and battery switches can separately control the use of solar cell. Easy to Install: Install the exhaust fan on the car window, according to the manual adjust the rubber strip, and roll up the window to complete. There is no plug-in installation line, and it will not damage the vehicle. It can be used continuously on rainy days. High Speed Exhaust: Three duct and three motor design improve the exhaust speed effectively, solar powered exhaust fan rotates at 4500 revolutions per minute. Packing List: 1 * Car solar powered exhaust fan, 1 * Fixde long rubber strip,1 * Fixde short rubber strip, 1 * English manual.